A Knaresborough group has found information that a small cannon that rested on the banks of the River Nidd in Knaresborough may have been dropped into the river around 60 years ago.
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Renaissance Knaresborough has now sorted out a team to try and find the cannon.
The hunt continues on July 16 with a team of divers from Harrogate British Sub Aqua Club (BSAC) trying to locate the missing gun.
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The last record of the cannon was on the pathway next to Marigolds Cafe near the railway bridge.
The search tomorrow will be at 7.00pm.
Liz Baxandall, a volunteer at Renaissance Knaresborough, said: "No one is sure whether it will be there or not but it's exciting to try and find out. It is a bit of a mystery and everyone in the community would love to know what happened to it. It will be really nice to see what happens."